茂兰喀斯特森林林窗内土壤碳氮磷及化学计量特征的影响因素研究  

Determinants of Soil Carbon,Nitrogen Phosphorus and StoichiometricCharacteristics in the Maolan Karst Forest Gaps

作　　者：谢加琪 张广奇 李羽翎 阎玺羽 臧丽鹏 刘庆福 陈丹梅 隋明浈 何跃军[1,2] XIE JIAqi;ZHANG Guangqi;LI Yuling;YAN Xiyu;ZANG Lipeng;LIU Qingfu;CHEN Danmei;SUI Mingzhen;HE Yuejun(College of Forestry,Guizhou University,Guiyang Guizhou 550025,P.R.China;Forest Ecology Research Center,Guizhou University,Guiyang Guizhou 550025,P.R.China;Guizhou Libo Observation and Research Station for Karst Forest Ecosystem,National Forestry and Grassland Administration,Libo Guizhou 558400,P.R.China;Fanjingshan National Nature Reserve Administration,Guizhou Province,Tongren Guizhou 554300,P.R.China)

机构地区：[1]贵州大学林学院,贵州贵阳550025 [2]贵州大学森林生态研究中心,贵州贵阳550025 [3]贵州荔波喀斯特森林生态系统国家定位观测研究站,贵州荔波558400 [4]梵净山国家级自然保护区管理局,贵州铜仁554300

出　　处：《西部林业科学》2024年第2期99-107,共9页Journal of West China Forestry Science

基　　金：国家自然科学基金委员会-贵州省人民政府喀斯特科学研究中心项目(U1812401);国家自然科学基金地区项目(32360278、 32360380);贵州大学人才引进项目(贵大人基合字[2017]40号);贵州省科技支撑项目(黔科合支撑[2019]2874、黔科合支撑[2023]一般111);贵州省基础研究计划项目(黔科合基础[2020]1Y124、黔科合基础-ZK[2021]一般094、黔科合基础-ZK[2022]一般036、黔科合基础-ZK[2022]一般079)资助。

摘　　要：为了解喀斯特森林林窗不同特征下土壤碳氮磷及化学计量特征的影响因子,以评价喀斯特森林林窗内土壤生态系统养分状况,以茂兰喀斯特森林林窗为对象,监测林窗特征(大小、年龄及形成方式),测定林窗内土壤有机碳(SOC)、全氮(TN)、全磷(TP)含量,分析林窗特征、地形和光环境等因子对碳氮磷及化学计量特征的影响。结果显示:(1)林窗内土壤碳氮磷及化学计量特征变异为中等程度(0.10~1.00)。林窗年龄对SOC、TN及C︰P和N︰P具有显著差异,而大小和形成方式影响不显著。(2)林窗特征、光环境和地形因子的前两个轴对土壤碳氮磷含量及化学计量特征累积解释分别为75.07%和72.80%。地形因子对土壤碳氮磷的影响较大,而林窗特征对土壤化学计量特征影响较大。研究结果表明:地形和林窗特征都对林窗内土壤碳氮磷及化学计量特征影响强烈。其中林窗年龄是土壤化学计量特征的重要影响因子,可以促进SOC、TN、C︰P、N︰P增加,为研究喀斯特森林恢复和可持续发展提供数据支撑。This research aimed to elucidate the influential factors on soil carbon,nitrogen,phosphorus,and their stoichiometric characteristics under diverse canopy gap characteristics in karst forests,thereby assessing the nutrient status of soil ecosystem within these gaps.The study was conducted in the canopy gaps in Maolan karst forests,where we monitored gap characteristics(size,age and formation cause)and quantified soil organic carbon(SOC),total nitrogen(TN),and total phosphorus(TP)contents.We further examined the effects of gap characteristics,topography,and light conditions on the soil carbon,nitrogen,phosphorus content and their stoichiometry.Our findings revealed a moderate variability in soil carbon,nitrogen,phosphorus,and stoichiometric properties within the canopy gaps,with values ranging from 0.10 to 1.00.The gap age showed significant differences in influencing SOC,TN,and the ratios of C︰P and N︰P,whereas gap size and formation cause exhibited negligible effects.Through RDA,it was determined that environmental factors and canopy gap characteristics collectively accounted for 75.07%and 72.80%of the variation in soil carbon,nitrogen,phosphorus contents and their stoichiometric characteristics,respectively.Topographic factors had a strong influence on soil carbon,nitrogen and phosphorus,while forest window characteristics had a strong influence on soil stoichiometric characteristics.The results of the study underscore the importance of topography and canopy gap characteristics in modulating soil carbon,nitrogen,phosphorus and stoichiometric properties.The findings underscore the age of canopy gaps as a critical determinant in the modulation of soil carbon,nitrogen,phosphorus,and stoichiometric properties,facilitating the enhancement of SOC,TN,C︰P,and N︰P ratios.This study provides vital empirical support for advancing research on karst forest recovery and sustainable development.

关 键 词：喀斯特森林 林窗特征 土壤碳氮磷 化学计量特征 

分 类 号：S714[农业科学—林学]